CN109386643B

CN109386643B - Stator for electric valve and electric valve

Info

Publication number: CN109386643B
Application number: CN201810751799.6A
Authority: CN
Inventors: 中川大树; 土井琢郎
Original assignee: Saginomiya Seisakusho Inc
Current assignee: Saginomiya Seisakusho Inc
Priority date: 2017-08-08
Filing date: 2018-07-10
Publication date: 2021-05-07
Anticipated expiration: 2038-07-10
Also published as: JP6798948B2; CN109386643A; JP2019032024A

Abstract

The present invention relates to a stator for an electric valve and an electric valve, and more particularly to a stator for an electric valve used in a refrigeration cycle system of an air conditioner or the like and an electric valve provided with the stator for an electric valve. In an electric valve in which a stator (21) is mounted to a valve device in which a housing (40) for housing a magnetic rotor (22) is assembled to a valve body (30), a bracket (1) for fixing the stator (21) to the housing (40) is simply and reliably mounted to the stator (21). A bracket (1) is attached around an opening (21H1) on the valve body (30) side of a stator (21). The bracket (1) is composed of an elastic piece (11), a convex part (12) and a plate-shaped base part (13). The convex portion (12) is engaged with the concave portion (40a) of the housing portion (40). The plate-like base (13) is disposed so as to face a plane orthogonal to the axis (L) of the stator (21). The bracket (1) is fixed to the stator (21) by the elastic force of the plate-shaped base (13).

Description

Stator for electric valve and electric valve

Technical Field

The present invention relates to a stator for an electric valve used in a refrigeration cycle system of an air conditioner or the like, and an electric valve provided with the stator for an electric valve.

Background

Conventionally, as such an electrically operated valve, there is an electrically operated valve in which a valve body is operated by rotation of a magnetic rotor of a motor unit such as a stepping motor. In such an electrically operated valve, it is necessary to seal the fluid flow path, and the magnetic rotor of the motor unit is accommodated in a cylindrical housing portion configured to have a sealed structure together with the valve main body. The stator of the motor unit is disposed on the outer periphery of the housing unit. For example, japanese patent laid-open No. 2006-20479 (patent document 1) and 5707114 (patent document 2) disclose similar motor operated valves.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2006-20479

Patent document 2: japanese patent No. 5707114

Disclosure of Invention

Problems to be solved by the invention

In recent years, the outdoor unit of an air conditioner has been increasingly space-saving, and the improvement of energy saving has been also emphasized, and the shape of piping in the outdoor unit has been diversified and complicated. The space inside the outdoor unit having such complicated piping is small, and therefore, the shape of the valve device is limited. In the technique of patent document 1, a bracket for fixing the stator is provided above the stator, and the bracket and the housing portion are configured to protrude upward from the stator. Therefore, there is room for improvement in terms of space saving. In contrast, in the technique of patent document 2, the bracket is provided below the stator, and the length of the case portion protruding upward can be suppressed. However, in the technique of patent document 2, since the bracket and the stator are fixed by welding, there is a problem that the fixing is not reliable and the fixing portion is easily loosened.

The invention provides an electrically operated valve, in the electrically operated valve of a valve device which is formed by assembling a shell part for accommodating a magnetic rotor on a valve body and installing a stator, a bracket for fixing the stator on the shell part is simply and reliably installed on the stator, and the electrically operated valve is miniaturized.

Means for solving the problems

The stator for an electric valve according to claim 1 is mounted on a valve device that operates by driving of a motor unit, and constitutes the motor unit together with a magnetic rotor on the valve device side, and is characterized by comprising an elastic member that engages with the valve device to fix the stator for an electric valve and the valve device, the elastic member including: an elastic piece engaged with the valve device; and a plate-shaped base portion disposed to face a perpendicular plane with respect to an axis of the stator for the electric valve, wherein the elastic member is fixed to the perpendicular plane by an elastic force of the plate-shaped base portion.

The stator for an electric valve according to claim 2 is the stator for an electric valve according to claim 1, wherein an end portion of the plate-like base portion of the elastic member is engaged with an end portion of the orthogonal plane, and at least a part of the plate-like base portion is elastically deformed, whereby the elastic member is fixed to the orthogonal plane.

The stator for an electric valve according to claim 3 is the stator for an electric valve according to claim 2, wherein the plate-shaped base portion includes: bending the two end parts of the rectangle into right-angled side plates; and a claw provided on the side plate, wherein both side portions of the orthogonal plane are sandwiched by the side plate, and the claw is engaged with a back side of the orthogonal plane, so that the elastic member is fixed to the orthogonal plane.

The stator for an electric valve according to claim 4 is the stator for an electric valve according to any one of claims 1 to 3, wherein the valve device and a yoke of the stator for an electric valve are electrically grounded via the elastic member.

The electrically operated valve according to claim 5 is characterized in that the valve device includes the stator for an electrically operated valve according to any one of claims 1 to 4.

The effects of the invention are as follows.

According to the stator for an electric valve of claims 1 to 4, the elastic member such as the bracket is fixed to the stator for an electric valve by the elastic force of the plate-shaped substrate, and therefore the elastic member can be firmly fixed to the stator for an electric valve simply and reliably. Further, the elastic member is engaged with, for example, the outer periphery of the case portion on the valve body side, and therefore can be downsized.

According to the motor-operated valve of claim 5, the same effects as those of claims 1 to 4 can be obtained.

Drawings

Fig. 1 is a partially sectional side view of an electrically operated valve according to an embodiment of the present invention.

Fig. 2 is a bottom view of a main part of a stator for an electric valve according to an embodiment.

Fig. 3 is a bottom view of a main part of the stator and the bracket for the electric valve according to the embodiment.

Fig. 4 is a sectional view of the stator and the bracket for the electric valve according to the embodiment.

Fig. 5(a) and (B) are a sectional view and an exploded view of a-a of fig. 3.

Fig. 6 is a sectional view B-B of fig. 3.

Fig. 7(a) and (B) are views showing a first modification of the mounting structure of the bracket according to the embodiment.

Fig. 8(a) to (E) are views showing second to sixth modifications of the mounting structure of the bracket of the embodiment.

Fig. 9 is a sectional view of a stator and a bracket of a motor-operated valve according to a seventh modification of the embodiment.

Fig. 10 is a diagram showing a refrigeration cycle system according to an embodiment.

In the figure:

1-bracket (elastic member), 11-elastic piece, 12-convex part, 13-plate-shaped base, 20-stepping motor (motor part), 21-stator (stator for electric valve), 21H-insertion hole, 21H 1-opening part, 21K-skirt part, 21 a-bobbin, 21B-coil, 21 c-yoke, L-axis of stator, 22-magnetic rotor, 30-valve body, 31-first joint pipe, 32-second joint pipe, 310-housing, 40A-small diameter part, 40B-large diameter part, 40A-concave part, 100-electric valve, 200-outdoor heat exchanger, 300-indoor heat exchanger, 400-flow path switching valve, 500-compressor.

Detailed Description

Hereinafter, embodiments of the motor-operated valve according to the present invention will be described with reference to the drawings. Fig. 1 is a partial sectional side view of an electric valve according to an embodiment, which corresponds to a section C-C in fig. 3. Fig. 2 is a bottom view of a main portion of an electric valve stator according to the embodiment, fig. 3 is a bottom view of a main portion of an electric valve stator and a bracket according to the embodiment, fig. 4 is a cross-sectional view of the electric valve stator and the bracket according to the embodiment, fig. 5(a) and (B) are a cross-sectional view a-a and an exploded view of fig. 3, and fig. 6 is a cross-sectional view B-B of fig. 3. Note that the concept of "top and bottom" in the following description corresponds to the top and bottom in the drawing of fig. 1.

As shown in fig. 1, the motor-operated valve includes a bracket 1 serving as an "elastic member", a stepping motor 20 serving as a "motor unit", a valve main body 30, and a cylindrical housing portion 40 made of a non-magnetic material. The stepping motor 20 includes a stator 21, which is an "electric valve stator" described later, attached to the outer periphery of the casing 40, and a magnetic rotor 22 rotatably disposed inside the casing 40. Further, a predetermined gap is provided between the outer circumferential surface of the magnetic rotor 22 and the inner circumferential surface of the case portion 40.

The valve main body 30 has a housing 310 made of stainless steel or the like, and a valve member or the like is incorporated in the housing 310. The valve main body 30 is operated by driving the stepping motor 20 (rotation of the magnetic rotor 22), and controls the flow rate of the fluid flowing from the first joint pipe 31 to the second joint pipe 32 or the flow rate of the fluid flowing from the second joint pipe 32 to the first joint pipe 31.

The case 40 is hermetically assembled to the upper end of the housing 310 of the valve body 30 by welding or the like, and thus the valve body 30 and the case 40 constitute a "valve device".

The stator 21 is configured by winding

coils

21b and 21b around a resin bobbin 21a and laminating a pair of coil portions in the direction of the axis L. Further, a yoke (yoke) 21c having magnetic pole teeth 21d is integrally assembled to the bobbin 21a by molding.

The stator 21 has a cylindrical insertion hole 21H centered on the axis L at the center, and the magnetic pole teeth 21d of the yoke 21c are arranged on a part of the inner peripheral surface of the insertion hole 21H. The magnetic pole teeth 21d are in close contact with the outer peripheral surface of the housing portion 40.

According to the above configuration, in the stepping motor 20, the coil 21b generates magnetic lines of force by applying a pulse output to the coil 21 b. As a result, the magnetic poles (N, S poles) alternate with the magnetic teeth 21d, and magnetic attraction force and magnetic repulsion force are generated with respect to the magnetic rotor 22, whereby the magnetic rotor 22 rotates. As a result, the valve member inside the valve body 30 operates to variably control the opening degree of the valve port, thereby controlling the flow rate of the refrigerant flowing from the first joint pipe 31 to the second joint pipe 32 or from the second joint pipe 32 to the first joint pipe 31 as described above.

The stator 21 has a skirt portion 21K whose diameter is increased from the opening portion 21H1 of the insertion hole 21H toward the valve body 30 at the bottom portion on the valve body 30 side. The housing portion 40 includes a small diameter portion 40A that faces the outer periphery of the magnetic rotor 22 with the axis L as a central axis, and a large diameter portion 40B that expands in diameter from the small diameter portion 40A toward the valve body 30. In a state where the small diameter portion 40A of the case portion 40 is fitted into the insertion hole 21H of the stator 21 and the large diameter portion 40B of the case portion 40 is positioned on the valve body 30 side of the opening portion 21H1 of the insertion hole 21H, a part of the large diameter portion 40B is accommodated in the skirt portion 21K of the stator 21. Thereby, the stator 21 is fitted to the valve device.

A bracket 1 as an "elastic member" is attached to one portion around the opening 21H1 of the insertion hole 21H in the bottom of the stator 21. The bracket 1 includes, in the skirt portion 21K, an elastic piece 11 extending from the valve main body 30 side so as to face the opening portion 21H1 of the insertion hole 21H, a convex portion 12 formed on the elastic piece 11, and a plate-like base portion 13 formed integrally with the elastic piece 11. The convex portion 12 protrudes toward the center side (the axis L side) of the skirt portion 21K of the stator 21. The housing portion 40 has a plurality of recesses 40a formed on the outer periphery of the large diameter portion 40B, and the recesses 40a are configured to engage with the protrusions 12 of the bracket 1.

The bobbin 21a of the stator 21 has a rear cover 21a1 on the lower side, and the rear cover 21a1 is formed on a flange on the lower side of the bobbin 21a so as to be orthogonal to the axis L of the stator 21 and serves as a fixing function of the lead wire. The bracket 1 is fixed to the rear cover 21a1 by arranging the plate-like base 13 facing the bottom surface of the rear cover 21a1, i.e., a plane perpendicular to the axis L of the stator 21.

As shown in fig. 1, the convex portion 12 of the bracket 1 and the concave portion 40a of the housing portion 40 are engaged with each other in a state where the stator 21 is assembled to the valve device. Thus, the stator 21 is positioned around the axis L of the stator 21 with respect to the housing 40, and is attached to the housing 40 in a state where the stator is prevented from coming off in the direction of the axis L.

As shown in fig. 5(a) and (B), in the bracket 1, the plate-like base 13 includes a side plate 13a formed by bending rectangular opposite ends at right angles, and a claw 13B cut out from the side plate 13 a. Therefore, since the side plates 13a are bent at both ends, the whole structure is shaped like "コ". The bracket 1 is fixed to the rear cover 21a1 by sandwiching both side portions of the rear cover 21a1 of the stator 21 with the

side plates

13a, 13a and by engaging the

claws

13b, 13b with the upper surface of the rear cover 21a 1. At this time, the plate-shaped base 13 is elastically deformed at the portion of the tapered surface 21a2 of the side portion of the rear cover 21a1, and is fixed to the rear cover 21a1 by the elastic force of the

claws

13b, 13b and the plate-shaped base 13.

In this way, the bracket 1 can be easily fixed to the stator 21 only by engaging the side plate 13a and the claw 13b with the stator 21. Further, the bracket 1 can be reliably and firmly fixed to the stator 21 by the elastic force of the plate-shaped substrate 13.

As shown in fig. 3 and 6, the bracket 1 has a terminal piece 13c at one position on the side of the plate-shaped base 13, and the terminal piece 13c is pressed against the yoke 21c from the plate-shaped base 13 by the elasticity of the terminal piece 13c through a window 21a3 formed in the rear cover 21a1 of the stator 21. Thereby, the yoke 21c is electrically grounded to the bracket 1. The cradle 1 is electrically grounded to the case 40 via the convex portion 12 and the concave portion 40 a. This can prevent electrical noise between yoke 21c and case 40. Further, the plate-shaped base 13 may be directly grounded to a place of the yoke 21c, not via the terminal piece 13 c.

Fig. 7(a) and (B) are views showing a first modification of the mounting structure of the bracket. In the following modifications, the same elements as those in the embodiment are denoted by the same reference numerals as those in fig. 1 to 6, and overlapping descriptions are omitted as appropriate. The first modification is an example in which the protrusion 21a4 is formed between the tapered surfaces 21a2 and 21a2 on the back side of the rear cover 21a 1. Accordingly, when the bracket 1 is attached to the rear cover 21a1, the elastic deformation of the plate-like base 13 can be increased, and the bracket can be fixed more firmly than in the embodiment.

Fig. 8(a) to (E) are views showing second to sixth modifications. The second modification of fig. 8(a) is an example in which one side plate 13a of the bracket 1 is fitted so as to be drawn into the rear cover 21a 1. The third modification of fig. 8(B) is an example in which the

side plates

13a and 13a are formed to shorten the length of the plate-like base 13 of the bracket 1, and the slits 21a2 and 21a2 are formed in the rear cover 21a 1. The side plate 13a and the claw 13b are fitted into and engaged with the slits 21a2 and 21a 2. A fourth modification of fig. 8(C) is an example in which a bent portion 13d is formed in one side plate 13a of the bracket 1, and the bent portion 13d is locked to the rear cover 21a 1. The fifth modification of fig. 8(D) is an example in which bent portions 13D, 13D are formed in

side plates

13a, 13a on both sides of the bracket 1, and the bent portions 13D, 13D are locked to a rear cover 21a 1. A sixth modification of fig. 8(E) is an example in which the length of the plate-like base 13 of the bracket 1 is shortened, the bent portion 13d is formed at one side 13a, and the bent portion 13d is fitted into and locked to one slit 21a2 of the rear cover 21a 1. In fig. 8(a) to (E), the claw portions and the bent portions are different in shape, but are substantially shaped like "コ".

Fig. 9 is a sectional view of a stator and a bracket of a motor-operated valve according to a seventh modification of the embodiment. The seventh modification differs from the embodiment of fig. 4 in the shape of the rear cover 21a1 'of the stator 21 and the shape of the bracket 1'. In the seventh modification, the thickness W of the rear cover 21a 1' is made thicker than the dimension a of the rear cover 21a1 of the embodiment. W is preferably 2 times or more of A. The height H of the bracket 1' can be appropriately changed according to the W size and the like. Since the thickness W of the rear cover 21a1 ' is increased in this way, the strength of the rear cover is improved, and therefore, when the bracket 1 ' is attached to the stator in a single operation "click", the rear cover 21a1 ' is not broken, and the assembly reliability is improved. Further, there is no fear of breakage of the rear cover portion or the like due to a force received by the elastic piece 11 of the bracket 1' when the stator is attached to or detached from the valve device. Further, since the thickness W of the rear cover 21a1 'is made thicker than the dimension a and the lower end surface of the rear cover 21a 1' is made to protrude by the width C below the position of the lower end surface B (not shown casting resin surface) of the stator cover 21e as shown in fig. 9, the movable portion of the elastic piece 11 protrudes out of the casting resin, the strength of the rear cover is improved, and the casting resin can be prevented from peeling off due to the bending of the base of the elastic piece 11 when the stator is attached to or detached from the valve device, and the insulation in the stator is not easily deteriorated due to the intrusion of moisture into the gap. In addition, although the above description describes the case where the thickness W of the rear cover 21a1 'is made thicker than the a dimension, the same effect (improvement in insulation deterioration) can be expected by projecting the lower end surface of the rear cover 21a1 to the lower side than the B position even when the thickness W of the rear cover 21a 1' is thin as shown in fig. 4.

Fig. 10 is a diagram showing a refrigeration cycle system according to an embodiment. In the figure, reference numeral 100 denotes an electrically operated valve constituting an expansion valve according to an embodiment of the present invention, reference numeral 200 denotes an outdoor heat exchanger mounted in an outdoor unit, reference numeral 300 denotes an indoor heat exchanger mounted in an indoor unit, reference numeral 400 denotes a flow path switching valve constituting a four-way valve, and reference numeral 500 denotes a compressor. The motor-operated valve 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are connected by pipes as shown in the figure, and constitute a heat pump type refrigeration cycle. The accumulator, the pressure sensor, the temperature sensor, and the like are not shown.

The flow path of the refrigeration cycle is switched to two flow paths, i.e., a flow path during the cooling operation and a flow path during the heating operation, by the flow path switching valve 400. During the cooling operation, as shown by solid arrows in the figure, the refrigerant compressed by the compressor 500 flows from the flow path switching valve 400 into the outdoor heat exchanger 200, the outdoor heat exchanger 200 functions as a condenser, the refrigerant liquid flowing out of the outdoor heat exchanger 200 flows into the indoor heat exchanger 300 via the motor-operated valve 100, and the indoor heat exchanger 300 functions as an evaporator.

On the other hand, during the heating operation, as indicated by the broken line arrows in the figure, the refrigerant compressed by the compressor 500 circulates from the flow path switching valve 400 to the indoor heat exchanger 300, the motor-operated valve 100, the outdoor heat exchanger 200, the flow path switching valve 400, and the compressor 500 in this order, and the indoor heat exchanger 300 functions as a condenser and the outdoor heat exchanger 200 functions as an evaporator. The motor-operated valve 100 depressurizes and expands the refrigerant liquid flowing from the outdoor heat exchanger 200 during the cooling operation or the refrigerant liquid flowing from the indoor heat exchanger 300 during the heating operation, and controls the flow rate of the refrigerant.

While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and design changes and the like that do not depart from the scope of the present invention are also included in the present invention.

For example, in the above description, the housing portion 40 has a plurality of recesses 40a formed on the outer periphery of the large diameter portion 40B and configured to engage with the protrusions 12 of the bracket 1, and the protrusions 12 of the bracket 1 and the recesses 40a of the housing portion 40 engage with each other in a state where the stator 21 is assembled to the valve device. However, the configuration is not limited to the configuration in which the bracket (elastic member) is engaged in the recess of the outer periphery of the case portion on the valve body side, and the configuration in which the bracket (elastic member) is engaged in the recess of the outer periphery of the case portion other than the valve body side may be used. Further, the bracket (elastic member) may be engaged with the recess of the outer periphery of the valve body, instead of the recess of the case. Further, a bracket (elastic member) may be engaged with a fixed metal fitting on the outer periphery of the valve body. Further, a bracket (elastic member) may be engaged with the lateral joint such as the first joint pipe 31 in fig. 1.

Claims

1. A stator for an electric valve, which is mounted on a valve device operated by driving of a motor unit and constitutes the motor unit together with a magnetic rotor on the valve device side,

the stator for an electric valve described above is characterized in that,

an elastic member that engages with the valve device to fix the stator for the electric valve and the valve device,

the elastic member includes: an elastic piece engaged with the valve device; and a plate-like base portion disposed to face a plane orthogonal to the axis of the stator for electric valve,

the elastic member is fixed to the orthogonal plane by engaging an end of the plate-like base with an end of the orthogonal plane and elastically deforming at least a part of the plate-like base,

the plate-shaped base includes: bending the two end parts of the rectangle into right-angled side plates; and a claw which is provided on the side plate and is bent inward or outward and cut out from the side plate,

the elastic member is fixed to the orthogonal plane by clamping both side portions of the orthogonal plane by the side plates and by engaging the claws with the back side of the orthogonal plane,

a projection is formed between both end surfaces of the orthogonal plane on the side facing the plate-like base,

the lower end surface of the orthogonal plane is projected to a lower side than the position of the lower end surface of the stator cover covering the stator.

2. The stator for an electric valve according to claim 1,

the valve device and the yoke of the stator for the electric valve are electrically grounded via the elastic member.

3. An electric valve is characterized in that the electric valve is provided with a valve body,

the valve device includes the stator for an electric valve according to claim 1 or 2.